The chemical oxygen demand (COD)measures
the
Select one:
amount of oxygen that would be
removed from the water in order to oxidize
pollution
none of these
amount of oxygen required to oxidize
the calcium present in waste water
amount of oxygen required for growth of
microorganisms in water
Answers
Answer:
Biochemical oxygen demand (BOD) is the amount of dissolved oxygen needed (i.e. demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. The BOD value is most commonly expressed in milligrams of oxygen consumed per litre of sample during 5 days of incubation at 20 °C and is often used as a surrogate of the degree of organicpollution of water.[1]
BOD reduction is used as a gauge of the effectiveness of wastewater treatment plants. BOD of wastewater effluents is used to indicate the short-term impact on the oxygen levels of the receiving water.
BOD analysis is similar in function to chemical oxygen demand (COD) analysis, in that both measure the amount of organic compoundsin water. However, COD analysis is less specific, since it measures everything that can be chemically oxidized, rather than just levels of biologically oxidized organic matter.